Electric fan



FIG. 1 is a perspective view taken from above, the front and one side of the electric fan showing my new design;

FIG. 2 is a perspective view thereof taken from below, the rear and the other side;

FIG. 3 is a side view thereof in an alternative first position;

FIG. 4 is a side view thereof in an alternative second position; and,

FIG. 5 is a side view thereof in an alternative third position. 

The ornamental design for an electric fan, as shown. 